Visitor Template Method Strategy State Observer Memento Chain of
Design Patterns: Elements of. Reusable Object-Oriented Software. Reading Massachusetts: Addison Wesley Longman
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Design Patterns
Structural Patterns: Used to form large object structures between many disparate objects. Behavioral Patterns: Used to manage algorithms relationships
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Design Patterns
Un patron décrit à la fois un problème qui se produit très fréquemment dans l'environnement et l'architecture de la solution à ce problème de telle façon
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Design Patterns Elements of Reusable Object-Oriented Software
concrete design or implementation because a pattern is like a template that can sheet
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Creational Patterns
Design Patterns Cheat Sheet
Abstract Factory
Provides an interface for creating families of related or dependent objects without specifying their concrete classes
Client
ConcreteFactory
AbstractProduct
ProductB
ProductA
+CreateProductA()+CreateProductB()AbstractFactory
+CreateProductA()+CreateProductB()Structural PatternsAdapter
Converts the interface of a class into another interface clients expectClient
Adapter
+Request()Target
+Request()Adaptee +SpecificRequest()Structural Patterns (cont'd)
createsSingleton
Ensure a class only has one instance and provide a global point of access to itSingleton
-instance -Singleton()+GetInstance()Builder
Separates the construction of a complex object from its representation so that the same construction process can create different representations.
Director
+Construct()Builder +BuildPart()ConcreteBuilder
+BuildPart()ProductbuildsFactory Method
Defines an interface for creating an object but let subclasses decide which class to instantiateProduct
ConcreteProduct
Creator
+FactoryMethod()ConcreteCreator
+FactoryMethod()createsPrototypeSpecifies the kinds of objects to create using a prototypical instance and create new objects by copying this prototype
Client
ConcretePrototype1
+Clone()Prototype
+Clone()ConcretePrototype2
+Clone() Proxy Provides a surrogate or placeholder for another object to control access to itSubject
+Request()Client
RealSubject
+Request() Proxy +Request()Flyweight Uses sharing to support large numbers of fine-grained objects efficientlyFlyweight
+Operation(state)FlyweightFactory
+GetFlyweight(key)Flyweight
+Operation(state)UnsharedFlyweight
+Operation(state)Client
Bridge
Decouples an abstraction from its implementation so that the two can vary independentlyClient
Abstraction
+Operation()ConcreteImplementorA +OperationImpl()Implementor
+OperationImpl()ConcreteImplementorB
+OperationImpl()Composite
Composes objects into tree structures to represent part-whole hierarchiesClient
Component
Leaf +Operation()Composite
Attaches additional responsibilities to an object dynamicallyComponent
+Operation()Decorator
+Operation()ConcreteComponent
+Operation()ConcreteDecorator
+Operation()+AddedBehavior()Facade
Provides a unified interface to a set of interfaces in a subsystemFacade
Subsystem
Behavioral Patterns
Design Patterns Cheat Sheet
Chain of Responsibility
Avoids coupling the sender of a request to its receiver by giving more than one object a chance to handle the request
Client
ConcreteHandler1
+HandleRequest()Handler
+HandleRequest()ConcreteHandler2
+HandleRequest()Command
Encapsulates a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations
ClientInvoker
Command
+Execute()ConcreteCommand +Execute()Receiver +Action()Interpreter
Given a language, defines a representation for its grammar along with an interpreter that uses the representation to interpret sentences in the language
ClientContext
TerminalExpression
+Interpret(context)AbstractExpression
+Interpret(context)NonterminalExpression
+Interpret(context)Iterator
Given a language, defines a representation for its grammar along with an interpreter that uses the representation to interpret sentences in the language
Client
Aggregate
+CreateIterator()ConcreteAggregate +CreateIterator()Iterator
+First()+Next()+CurrentItem()ConcreteIterator
+Next()Mediator
Defines an object that encapsulates how a set of objects interactMediator
Colleague
ConcreteColleague1
ConcreteColleague2
ConcreteMediator
Memento
Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later
Caretaker
Originator
+SetMemento(memento) +CreateMemento()Memento +GetState() +SetState()Behavioral Patterns (cont'd)
Observer
Defines a one-to-many dependency between objects so that when one object changes state all its dependents are notified and updated automatically
Observer
+Update()Subject
ConcreteSubject
-subjectStateConcreteObserver -observerState State Allows an object to alter its behavior when its internal state changes State +Handle()ConcreteStateA
+Handle()ConcreteStateB
+Handle()Context
+Request()Strategy
Defines a family of algorithms, encapsulate each one, and make them interchangeableStrategy
+AlgorithmInterface()StrategyA
+AlgorithmInterface()StrategyB
+AlgorithmInterface()Context
TemplateMethod
Defines the skeleton of an algorithm in an operation, deferring some steps to subclassesAbstractClass
ConcreteClass
TemplateMethod
Represents an operation to be performed on the elements of an object structureClient
Visitor
ConcreteElementA
+Accept(visitor)Element
+Accept(visitor)ConcreteElementB
+Accept(visitor)ConcreteVisitor
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